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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a13a0d2ef66ecbd796c0c11ac29a32429e08e5a87e88dd8e35284395d1598ac' 
  AND token = 'McubTN1Gd2aqAGl/Cc0Ed5BkX591hV/4H8FTESuFauM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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