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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e9a0a9f11b6312211e42b62ce889349d9242c9751432acba3a153264c05bd3' 
  AND token = '23l8Oa6IAYhgJfeWgRlA5L6aioFqdIQK5fMsqSt5BOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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