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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720c30a2fbee9ab33c273b10e9203b3fa3c0026564a24615d7a9ea6aee93677b' 
  AND token = 'MQpqUMLjx7M0KCtFKGJ4dT7vTXqHeKKoG/kMJLrmR3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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