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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2e1602e845ddec4f54623dc685dbb39f8cc563c552cadca7dcbfafd9df53ce' 
  AND token = '5AvU8ahT/GCjKCcA0MHu7SgMQqq+hSw1YaKxszI397w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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