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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1f3f9dcbe665de3de33abe35144333d4a01a53cd989a9a5c42bbc9889ef32e' 
  AND token = '4ewhCgm6tblteU4UJZ4N/MStjsvNyn+6DmRx31taOhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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