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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af2b98ed4e18f029dbc362fa028a4e457b453b435bfa6ca67f6ad96633e0bdf' 
  AND token = '5uHkterHd+h97iIVj3KxshP3/SXJTu/tUxRMSi9WsN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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