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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26f1ab1aaa9e8acafcc3f704cec73850d4ab13177a06fac0a4a0a040dc3dbe5' 
  AND token = 'zOjExW8kEu/5fQhto3eQjVF4Zv/RlHtES3tIThrcDy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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