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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39968a2fa75b8d5feeb38b663bdd6c99bfe296bafe5717336f16eae57a9d8495' 
  AND token = '8l413Hu2zHy+m44j998PvxWp90SoIf+GAlkKVjJPsVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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