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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c193fa48ae6670a8fb81e3c25af95a99eaec8226a43acb192596e293a4ce312' 
  AND token = '1so7mqa009AiSwnbEAcrencfg0eVkIrkD48MJwNg1MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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