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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd237ee35f81bbf668f8b03cc7922d8d91a544f01f77e312b28750edcc6bfb956' 
  AND token = 'Lsv24FFrQkD+L06l0d1xzOTMGSSMoTpCXXE0Z0y39+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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