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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109457fe802867f493bac8a13a75fc5e97a2ae3836665ce0f30de6262499733e' 
  AND token = 'YCefKIUAg8nGNZJztSZzMIU+2Ha4tXbU0IL+ilY3PaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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