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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da523a2bc580bb0152ed59a3c9854cdce5c90681389d76af5671a9d5aa6c2d78' 
  AND token = '0e5ZDS9Qa/ZI8POK6uwkINntIDwNGNIW6bElkNoVPxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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