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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf168cc9c4d3b7aec053f77e9d0a060dcd14b4452b8477a38cb1cecb7fe3e8b' 
  AND token = 'jA7zgf/8mVErQPq69x7DV0PQUM6S4N9Z0xELm6ZungE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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