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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bf04c372bf40e32c6d50d9ce4e00ebe6c78d73ec5b50b276f52bf3e26a8c9e' 
  AND token = 'LcOPOzJ/MrIfpNE8PQYNKaYdO8iC8P8N/IarVLFj7Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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