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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee8773884e1128d88003e43df031e4bb170e58e41389cf77ae1cb8970b90c3a' 
  AND token = 'TIoY/eS5uk+oC0Rn1qQQQPDC/AZo8rmjTMY0XqxYpM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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