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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483c3f68ac72a937c0d23d3cbc8924ac4ae821b85d91a9b5ab59060b2185437e' 
  AND token = 'S6/bYiQnfqsR9MlV3H2Ynbe+JLLwQotdL3QJ9u7rpYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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