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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a444f39fdc64a62a119dd4917075101d169c632356b82c99c432732ad4ae439b' 
  AND token = 'aDoM2JCb7MObqiEASvCSEfaxSIFQqbaWBA5SzxcWaVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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