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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d1b5c5e6e61a60e89e2b308292ee75e4cca6c5de7cd47215ecc533207e5040' 
  AND token = '93cOJdjj4b2qgD1nt9/oMlABOfT4cFWH/aO70ArKeJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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