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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afdb7e94f7461d51f25ce329c932a03e377505479d4382be29935f9bec955439' 
  AND token = 'Y0Bwr7RsmT6DaG4zXwfoaf1h3m6ImzKmMuo2fnhled0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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