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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c296c89b6433256dc8fce50bd50d3f6ec05504f35e16eb0cabe2917b34e8e3' 
  AND token = 'xtr3WLp/nftLrkkGJXAwJaeeb0zDfJ6xWSot11rbhxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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