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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9aa1e2513b9b50f63312f3fd105e7bf8f5dcb07f960bf339ca2809e9d6bf304' 
  AND token = 'bcObChBaievHij0dUOub5F4T/pcy8/hv3IYC7v+umek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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