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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad902780d707c64bde1cd8a2eafd385bb2d2355cc9fa923160c100ac15081b4' 
  AND token = 'MIMlcNuCTGDrJZfsK2PZx72qszg7VF6BU8sEWieC/eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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