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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b998b7d00b93d608dde1090510699343b49ae7e9a0970c818be39745a06112d' 
  AND token = 'eUB4EJwQt9HbBtGhh16Ul86y0yfAIWlInY3APAWCok8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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