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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70264361657bef180eb427baa5987b8feb31adf6eab3abd68251da1fe1c86248' 
  AND token = '46dFeTIWkTi2S3cRzDuwLnHwQDP825/Pst9z+kPeC4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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