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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2922b23caf2662014c9af23ca6c16135d55093dc3c234433fe5485a50fb6cdd6' 
  AND token = '3VLMTQ4CJH1yIqbfWgbr4sYNBzxbxYow5OinyuxSGvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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