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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035d046a11dcc67b6dc445d0d34ed1fc99a1f22a38f6df23d5cd80b482783f89' 
  AND token = 'phnBo20b5cWhwd1a91i4WVgsCu7qnRHTsULZYQp0cC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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