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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e8ea26b96abc8884f87b01ab69ce8d5787801c7072d3d4911c35b118669a25' 
  AND token = 'fL4aT9ucaSLa470i35hEx3AF5eOkqCRv3myP3tVUyV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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