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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0965a8da9242feaca1dff8910f54c52c06c6b3b6d8bd3b49cc4afa98c6cc4e7' 
  AND token = 'fGJrQXqyTMxWSmkdUhin7N/lD8t3FmzWqUmKnDIbP6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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