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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9047c81795e12f138429eb26d89c4e5dfcff578eb5ef1a8a0f968ce17a564b6' 
  AND token = 'DGnB2fmnC8ZMWfAfiyZ/yp03re30wPPRRjy2lbjhTJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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