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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343a0fe9dcb9c501f52d8f00ab423a93ac12658123c700e1603a835138b70ceb' 
  AND token = 'fIoW/9PMaZgJ9d2HvSGzHcvEKEVakgQR9Bf1BwU5g7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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