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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ef134030b5de927a8a2f1948d0b3dcb89d8b4b1bb491aee2ebaa0d031d5284' 
  AND token = 'A5LJFQUxwTnC002rnO/8ZdK0Y3Gl9Tr9WeAzK00ZovU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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