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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294950f809d09426ad0c472edeb76b52e78859a628bc737389e98091d0c8a434' 
  AND token = 'BMtbataijn7szB4A1WZfd4zCaAaBs8MH3JnSnPWGABw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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