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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3df969285837920da0f472e8cb7d4ea975ea025fee4144d87aad1648d2ad2f' 
  AND token = 'wMNqvgqai7XfOHztJ+UHQ6+krT/gb/FbQcuOkqhHaSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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