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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff08435c86232b3d4ac42cdebb8fb1c380ad3f4b26fcd02429f3a01482e724e0' 
  AND token = '/2jmqx0KusQnhDSxbn99VZCX01XdZ4lEn/nNkGQ0NE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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