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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e823e0d622dd1ea70d5337afa0ddedea99db226e754d5cab898392193ddaa0' 
  AND token = '1FdQTgHB1YnRQIRxhP9JmkzEUzpG0Sgy/TbXI8Gec6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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