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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5617c91bce1415ff724a350dbdf382991baa2aa225d2044cf3a33b359a0b91bc' 
  AND token = 'y2ZZrH6NKquzq5dxeY1HO7XdED1aGU29hq73FXXQunE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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