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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af0ebaa8cdc0ce384a75f01a8ffdadf4e8b9ee3150263b9e1c6aa820db5d8db' 
  AND token = 'PbP6mSGNtICNcbE0y+FoLbL400HwSRA2i+XqPbEItb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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