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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8df9bb0703d566d1b1044ae951f560da28d8ba8428358eebb009e487b1c728' 
  AND token = 'xTp0qXe7RnQ9myzR59QMCGEv1kLvEqm/YN3OGAgsi58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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