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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8516ddcda517c073e8f96276bf0723e6aa84b05737763a5d11c36b3de1ee426' 
  AND token = 'cZxT4GrahFvvQbRnwk6oMpQDsvARhX8l5/emuzC5Ct8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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