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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e58881c391755ac785bbca3813d5a512e70f8ed34e7e0dbf67ee72339c1a1a0' 
  AND token = '2LXBFNjerZfCc0gr9csUHGAn1YDfb4xxUV6pNg3PN2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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