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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befb71168bf6294ec73cec95e4264df1b48e0dbf7f726b769b0ddc526f01d342' 
  AND token = 'scXKsABhud559J5t7dRMZ5MbWWBBIi41+iArfdp2mIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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