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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0099748d4237d0fa280459061b3dfa777cd23b5a0846bd0467205c0b8d2f9ee' 
  AND token = 'I9uU8r+Il29MsdAHfs7PDuP+AeDL2+FxmFlifJlzbac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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