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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497c6d0e0cf58c7bc1d758cd8ceeb839fb00ae0d7cef9bc9bb9d9a3746234a2f' 
  AND token = 'iilCjdr1SCmPg3TSgu+iLxtEEKpkgwUn+Q9RzItgoLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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