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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add86d698203c3a87a6056afae469927cfd2f5d7d8567734f09d98bb3514b2c8' 
  AND token = '/oo7RV3THk7OPnzUoj7lOCin/eWDqw4ejv9GOIcNfxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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