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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bae7cc22034e98077c14cc4fa321b129d39ac4a0d5f54f3335ccbf6f6eab9a' 
  AND token = 'NVCnks7B2wYq+NzM93umqlVHR0z09cZf+30TUN7saNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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