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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c72b111ecae2715ac50a59d02d647594dfa834ad5b47b7399e8ad3c415e7dc' 
  AND token = 'bpRXQFvA6hWhjGtITPuCLSx5ikuk4CIUm/kQPQYiG1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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