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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470fb5c2058c0419c586369ba0349f513e0386f478abcb1f061184fc6996fc8b' 
  AND token = 'X/XMgyRcET/M6tt8G2CBtry8Gc1xgpX9AB93IdZubvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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