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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec1b5e30cf0ee7445b65ad1a6b019a2e34ab7ca156c0bb0beb06ddbfd349eb4' 
  AND token = 'loPi9XTcPWlTBfmmQezmjvfFq8ouRQOiPJF/qYopeoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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