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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720ae229a29e30b7326a01e6f33ec53dac9b3bbe3a3af009707f8cba89e26a81' 
  AND token = 'xfbrVy91DHpNXyxdAS+kse7K6SQHDp+Hd/bg2jKC3N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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