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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd69a7f6ba8343aa1ac16ce7116d5b5a1530a09abd908bdb93587d532239f87' 
  AND token = '4tsnv5C45Z4wkPcYsALAohowRir1/ZHUbJartmdRmkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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