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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62918db92d97c17f10a14858c373a95a920ac6d12cc3b79873332a1657219c00' 
  AND token = 'heSvb8jDbQAvMYTx13jmWtxQg8NkR2zGU5kBKRR01yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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