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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872d23e07819c014c9261e5dffa92167a70c433bd02e348f07b24d6afa8ea37b' 
  AND token = 'IwzVX5wiufrgZseNvXKOLo0VtR8yWjH5uitud6fH37Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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