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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2080b9fe5f65dc520b00b762303ab8aa2776b04b7cbcb8983036dca44c0ddb78' 
  AND token = 'WbUt6dY4/WYwZQnPSVZewibyDiSzNFpgdZco3B8eSt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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