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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30f702f1d1a07f6a418a9fea8ab2a5d385c21fa688df8be998ed62bf0c78e56' 
  AND token = 'MKgdOjGce72iFl/Yl0dR/B3pxunJDT3A4N025fEVmdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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