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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ef65d214e1439d6f190bc5135ea0637fcb5bd666d15a8d81d41c5df91b92f4' 
  AND token = 'P7Bq4IRGUy6v4ObMKAZJO/58sfDXeN87J/h8Qdw4f98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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