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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f126a809482fb9b6b69a7d8ef38069cd504ae9444c411cac766345288ba03f43' 
  AND token = 'A0Ge7VbNZCKxtWlcPXm0V+APndbeaUvouQlPHPCfPDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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