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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a973055923f00865b5b2e75f122d0d41ae3796aa0f643a70034273800cc3d2' 
  AND token = '6O6j9P47/v2abG44GngxLtQ/bi2QQvqo9wFr0LlCZ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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