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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd9082b320dbfb592c34ee38bbfbfbd23add377f5c6f640dd087ad134d7f53a' 
  AND token = '1IkvIDYDTcrU2nnQd99oh6zqIw7u6aiSeKIidJaEVF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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