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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0684fda8aac5f3352def8832465ccc0bd80bf6159f05130feeed0e4f8821e8d' 
  AND token = '/G9R6O50RmdhuHwzX5EfQtX8lNXGO9UvJrD7InvPGJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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