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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58986f5b076a5630141b59e13616a64104ee3e5e3f4a01f9f60c3abccbd0d9c' 
  AND token = 'WuUIRlwFFuKVFwvT0pKhiWyCANvgAbxQH0i7w5VnGwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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