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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626a13cf48a6349168a3741e48b2731eeb2fc0adb94013a40ab7ab4c401d6f39' 
  AND token = 'Ie40adaInqpaIZckG3MtSa9UxFRo1rAZe/Wv6+r7+N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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