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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20214222bb45f4dcd45bd88234c5f71a04f92a2c5b07ecf3d62df3127b292c1a' 
  AND token = 'XHIPIcdN4jBho0Bu2iGPz19L4g9F75xvWdHh7nqkoeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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