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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b4e22450661cb844d6a16be2d97e1352d66c4f05ac5429ed0a3e8e4efae0b0' 
  AND token = 'SmOgPFvNsL4eGIdPz/f7k4KxjSdP32g1adMSXKYIHBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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