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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e88f2591d3d31a796b4058512ace042ed0ba544fb7859e9b85bf4b674efe006' 
  AND token = 'mbbtQtNl6yLxtmU6ki2Jhf08+RExo6UGAgu7P7iPntc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}