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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c170da15caef3b167e9ae70948f044e997d8bc3a6aec01c9bbe962de30dfd537' 
  AND token = 'aG68AxfRnUjxMyXucHf4gn77cXrhUEkaVDg+Pd9Ef+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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