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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7085d3c6f353716935d383a9896a6610acbb77445b415052fb34f7fea590921e' 
  AND token = 'g6ZKBccCa4UKbTi1RknZ3tk9YExKQflfaaIMjFCNNnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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