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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f976eef2c54d1de50f28a845fbd150d362b023c8c3e514a7ee37133b0163e0b' 
  AND token = 'pBf1jWsn84AuRRHq7WpTnXXlkrcnYpLZsUD98wBaVX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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