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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a840fb21dd2beae98a857ea54088b46b09c34493cdaae5dd735dcec9ca1fb699' 
  AND token = 'l3Io7fcE/OdyBVbcMf/+eR7z0JxOUuQgCTWIYbiZ9LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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