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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df1be4cd80fa96c3302071b287d4fc1f92a3c3dc347207ee6224e688d98ffd7' 
  AND token = 'Gyxn0pBGBDcfZ0T9zVI0JenTLwR/mwz8PgWYZevnRic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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