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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f17931ed425c52b5d0750cb2c656a6a35894d9c90e3df4f4a31de8111ff0a8e' 
  AND token = 'tJeA4FtPrsA05bJKTYucD4pDZSkNr40bp00lztWhLeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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