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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c54e15a940a14c71de7c710c14f05910f0048047a12f5908b98dd65ccd9eb2' 
  AND token = 'dl0HxdySFRony4dJJmdlLZ6vHSt/4ognHDMs/MNEQSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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