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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c623896da09867efd733d078da815f5d4f11269a575bf9b93fa835a75327a2' 
  AND token = 'EpSRWc04EzAJ917kmyIPV/pzYxHZ20GT8+Z/XGxP8Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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