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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae313c1b04b1b567e5d9a15f54b6f0daa44078fffc23c2688e143adf14ce8271' 
  AND token = 'HGgLWYTWe18iR4F8z2HUyQdRppQ1Xgxnopto1v7h+I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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