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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d01b3841dfe3f1afa33b19c09757dbfbac5f80c29b79e4d86fba05fd6ea483c' 
  AND token = 'q2nCOOS7nkcJcy3i7PVtQzQdX5Yd9CebvHjU8WUrWAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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