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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd35dd1be0647bc325d609bb01003a0425748dff1ab612d2f3c61c7899776b58' 
  AND token = '/0C4a7Zh7PIAL6Zya0WsLK3c2+xqaS1stOM7w8+Xf+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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